where P is the rainfall, I is the irrigation amount, DS change in the soil water storage in a
period, Dp is the deep percolation, and Ro is run-off amount. The units of all parameters in
this equation were millimeters. In this study, Ro was assumed to be zero because the earth
bunds between adjacent sub-plots also prevented the run-off and run-on. Deep percolation
was calculated from the difference between the field capacity moisture level and total soil
moisture level at 0.60 m soil depth in the observed period (Kashyap and Panda, 2003).
Potato production costs and sale prices were obtained from the Chamber of Farmer
Association. Gross revenues were calculated from the multiplication of first and secondclass
yield and their prices. Irrigation costs were calculated from the data prepared by Sener
et al. (1994).
where P is the rainfall, I is the irrigation amount, DS change in the soil water storage in a
period, Dp is the deep percolation, and Ro is run-off amount. The units of all parameters in
this equation were millimeters. In this study, Ro was assumed to be zero because the earth
bunds between adjacent sub-plots also prevented the run-off and run-on. Deep percolation
was calculated from the difference between the field capacity moisture level and total soil
moisture level at 0.60 m soil depth in the observed period (Kashyap and Panda, 2003).
Potato production costs and sale prices were obtained from the Chamber of Farmer
Association. Gross revenues were calculated from the multiplication of first and secondclass
yield and their prices. Irrigation costs were calculated from the data prepared by Sener
et al. (1994).
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